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AGP(4) FreeBSD Kernel Interfaces Manual AGP(4)
NAME
agp - generic interface to the Accelerated Graphics Port (AGP)
SYNOPSIS
device agp
DESCRIPTION
The agp driver provides uniform, abstract methods for controlling the
following devices:
Ali: M1541, M1621 and M1671 host to AGP bridges
AMD: 751, 761 and 762 host to AGP bridges
ATI: RS100, RS200, RS250 and RS300 AGP bridges
Intel: i820, i840, i845, i850, and i860 host to AGP bridges
Intel: i810, i810-DC100, i810E, i815, 830M, 845G, 845M, 852GM, 852GME,
855GM, 855GME, 865G, 915G and 915GM SVGA controllers
Intel: 82443BX, 82443GX, 82443LX, 82815, 82820, 82830, 82840, 82845,
82845G, 82850, 82855, 82855GM, 82860, 82865, 82875P, E7205 and
E7505 host to AGP bridges
NVIDIA: nForce and nForce2 AGP controllers
SiS: 530, 540, 550, 620, 630, 645, 645DX, 648, 650, 651, 655, 661,
730, 735, 740, 741, 745, 746, 760 and 5591 host to AGP bridges
VIA: 3296, 82C597, 82C598, 82C691, 82C694X, 82C8363, 8235, 8237,
8361, 8367, 8371, 8377, 8501, 8601, 862x, 8633, 8653, 8703,
8753, 8754, 8763, 8783, KT880, PM800, PM880, PN800, PN880,
PT880, XM266 and XN266 host to PCI bridges
The most common application of agp is for running X(7)
(ports/x11/xorg-docs) on the Intel i81x controllers.
IOCTLS
The following ioctl(2) operations can be performed on /dev/agpgart, which
are defined in <sys/agpio.h>:
AGPIOC_INFO
Returns state of the agp system. The result is a pointer to the
following structure:
typedef struct _agp_info {
agp_version version; /* version of the driver */
uint32_t bridge_id; /* bridge vendor/device */
uint32_t agp_mode; /* mode info of bridge */
off_t aper_base; /* base of aperture */
size_t aper_size; /* size of aperture */
size_t pg_total; /* max pages (swap + system) */
size_t pg_system; /* max pages (system) */
size_t pg_used; /* current pages used */
} agp_info;
AGPIOC_ACQUIRE
Acquire control of the AGP chipset for use by this client.
Returns EBUSY if the AGP chipset is already acquired by another
client.
AGPIOC_RELEASE
Release control of the AGP chipset. This does not unbind or free
any allocated memory, which is the responsibility of the client
uint32_t agp_mode; /* mode info of bridge */
} agp_setup;
The mode bits are defined in <sys/agpio.h>.
AGPIOC_ALLOCATE
Allocate physical memory suitable for mapping into the AGP
aperture. This ioctl(2) takes the following structure:
typedef struct _agp_allocate {
int key; /* tag of allocation */
size_t pg_count; /* number of pages */
uint32_t type; /* 0 == normal, other devspec */
uint32_t physical; /* device specific (some devices
* need a phys address of the
* actual page behind the gatt
* table) */
} agp_allocate;
Returns a handle to the allocated memory.
AGPIOC_DEALLOCATE
Free the previously allocated memory associated with the handle
passed.
AGPIOC_BIND
Bind the allocated memory at given offset with the AGP aperture.
Returns EINVAL if the memory is already bound or the offset is
not at AGP page boundary. This ioctl(2) takes the following
structure:
typedef struct _agp_bind {
int key; /* tag of allocation */
off_t pg_start; /* starting page to populate */
} agp_bind;
The tag of allocation is the handle returned by AGPIOC_ALLOCATE.
AGPIOC_UNBIND
Unbind memory from the AGP aperture. Returns EINVAL if the
memory is not bound. This ioctl(2) takes the following
structure:
typedef struct _agp_unbind {
int key; /* tag of allocation */
uint32_t priority; /* priority for paging out */
} agp_unbind;
FILES
/dev/agpgart AGP device node.
SEE ALSO
X(7) (ports/x11/xorg)
HISTORY
The agp driver first appeared in FreeBSD 4.1.
FreeBSD 14.0-RELEASE-p11 November 28, 2007 FreeBSD 14.0-RELEASE-p11